 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Saab Cars / March 2006boost gauges and calibration
Since we're talking about turbo boost gauges, etc. and what happens when the vacuum hose is not doing it's job, are the stock gauges that Saab puts into the instrument clusters actually calibrated in a way that makes sense? it's fine to say 'dont take it into the red' but that means nothing to most people. 8-) When I've had the engine running in the 1983 8V turbo car I'm repairing, it's a bit confusing with the way the needle changes position depending on how much throttle the engine is given, etc. Once I get it roadworthy again (still needs tie-rod ends, ball joints and inner CV boots to be replaced first), I'll take it for a proper drive on the local road at a quiet time of the day to figure out what the turbo does (or doesn't do). I guess it's one reason people fit boost gauges with properly calibrated scales. Craig.  SignatureCraig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900@lios.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonaut@gmail.com | Web-forums, galleries, library, links, etc. > Since we're talking about turbo boost gauges, etc. and what happens when > the vacuum hose is not doing it's job, are the stock gauges that Saab puts > into the instrument clusters actually calibrated in a way that makes > sense? > it's fine to say 'dont take it into the red' but that means nothing to > most people. 8-) When I've had the engine running in the 1983 8V turbo car [quoted text clipped - 4 lines] > local road at a quiet time of the day to figure out what the turbo does > (or doesn't do). If it doesn't make sense it is probably because you don't understand what it is measuring. The gauge measures vacuum and boost. When it is at rest (engine off) then it should be displaying atmospheric pressure. Anything below this rest position is vacuum, anything above is positive pressure (boost). Colour calibration makes much more sense than numbers. What are you going to calibrate it in? Bars, PSI, Pascals. What meaning do those calibrations have to most people? SFA. It is much easier to see that the guage is in the "yellow" and know that is operating on moderate boost. Excursions into the "red" are perfectly normal by the way. > I guess it's one reason people fit boost gauges with properly calibrated > scales. They would most likely be ricer type w.nkers. >If it doesn't make sense it is probably because you don't understand what it >is measuring. Probably - this is the first turbo Saab I've owned. >The gauge measures vacuum and boost. When it is at rest (engine off) then >it should be displaying atmospheric pressure. Anything below this rest >position is vacuum, anything above is positive pressure (boost). Ok ta. I thought it might be something like that given that it's got a direct vacuum line feed connection from the intake manifold going via the over-pressure switch. >Colour calibration makes much more sense than numbers. What are you going >to calibrate it in? Bars, PSI, Pascals. What meaning do those calibrations >have to most people? SFA. >It is much easier to see that the guage is in the "yellow" and know that is >operating on moderate boost. Excursions into the "red" are perfectly normal >by the way. I guess, but still having an actual scale with real numbers gives it some meaningful quantification to go along with the coloured bands. >> I guess it's one reason people fit boost gauges with properly calibrated >> scales. >They would most likely be ricer type w.nkers. Think WRX, etc. 8-) he he or even, dare I mention it, a Nissan Sylvia. ewww Craig. SignatureCraig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900@lios.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonaut@gmail.com | Web-forums, galleries, library, links, etc. > Ok ta. I thought it might be something like that given that it's got a > direct vacuum line feed connection from the intake manifold going via the > over-pressure switch. And something else. Your'e not going to see any real boost if you are just revving its poor arsehole out in your backyard. It needs to have a realistic load so that you can open the throttle and pump a decent load of air through the engine. Just revving it in neutral doesn't require much air even to redline it. Suggest putting the handbrake on really hard or park up against a tree stump, (wifes car etc), bring it up to 2,500RPM ... 3000RPM and slip the clutch. The boost gauge should move nicely positive. >> Since we're talking about turbo boost gauges, etc. and what happens when >> the vacuum hose is not doing it's job, are the stock gauges that Saab [quoted text clipped - 34 lines] > > They would most likely be ricer type w.nkers. OK I admit to having a calibrated boost gauge. I am happy with PSI or Bar, and every site and news group I've visited to help me sort out my boost problems talks about setting base boost at about .35 Bar. Now I'm quite good with numbers, and can see patterns and sometimes even colours in a sheet of figures. (Red comes to mind when I'm looking at credit card statements!) I haven't yet found a site which tells me where 0.35 Bar is on the Saab Gauge. So yes I have an elkparts calibrated boost gauge, in a pod on top of the dash, as many many UK saabers do. I did go to the local "performance" parts store, but made a sharp exit when I was offered "pink or blue back light sir?" The gauge helps me to reset base boost every now and then, and doesn't look too shady... I've seen this expression "ricer" before and whilst I'm willing to admit, that as a normal man I have been known have a "Tommy Tank" occasionally, I'm not willing to admit to being a ricer until I know what one is. Could you enlighten us please? Cheers Al > I'm not willing to admit to being a ricer until I know what one is. http://en.wikipedia.org/wiki/Ricer SignatureMH '72 97 '77 96 '78 95 '79 96 '87 90 '91 900i > I've seen this expression "ricer" before and whilst I'm willing to admit, > that as a normal man I have been known have a "Tommy Tank" occasionally, I'm [quoted text clipped - 4 lines] > > Al Enlightment on the use of English is certainly needed by some posters. OK, I understand, thanks Fred. Now my Aero is no Ricer. Actually because of the "new car" snobbery that's prevalent in the UK it could almost be described as a sleeper, though the JT61 exhaust does tend to announce my presence and intentions :-) My point was that most C900 enthusiasts who fit them do it to allow them to set base boost, and monitor more accurately their turbo performance, which can drop/rise significantly under certain circumstances. You want a Ricer type mod, look here http://cgi.ebay.co.uk/Make-Your-Car-sound-Like-a-Turbo-NEW-OUT_W0QQitemZ80503462 66QQcategoryZ38786QQssPageNameZWDVWQQrdZ1QQcmdZViewItem I might just go back to a recirc valve if the local chavs 1.2 Puntos are going to start going whoosh... > Now my Aero is no Ricer. Actually > because of the "new car" snobbery that's prevalent in the UK it could > almost be described as a sleeper, though the JT61 exhaust does tend to > announce my presence and intentions :-) Sleeper? Mine is usually referred to as "a shed" :) Personally, I abhor new cars. I just don't get it. >>Now my Aero is no Ricer. Actually >>because of the "new car" snobbery that's prevalent in the UK it could [quoted text clipped - 3 lines] > Sleeper? Mine is usually referred to as "a shed" :) > Personally, I abhor new cars. I just don't get it. A car just has no personality until it's paid for, the warranty is expired, and it's all nicely broken in. There's nothing to really tinker with on a new car.
|
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.